POSNUMCON is a command-line (or console mode) program for converting between positional numeral systems written in C++. It is able to convert between any positional numeral system (e.g. decimal, octal, binary and hexadecimal) with base (radix) between 2-36 (there is the possibility for extension). It offers full support for big length, negative, and floating-point (fractional) numbers, saving calculation results to a text file. It is fully and easily customizable.

Binmay is a command line binary search and replace
program. It allows one to specify a binary string (in hex) to
search for and, optionally, a binary string to replace it with.
One can mask both search and replace strings as one can
mask an IP. It is handy for changing broken user SID/RIDs
in ntuser.dat files after you move a profile from somewhere
to somewhere else.